Word: afterbirth
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Dates: during 1951-1951
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...theory is right, it goes far to explain why poliomyelitis has been a serious problem in Southern California, with its high living standards and good sanitation, and rare amid the poverty and open sewers of Mexico's Lower California. Most U.S. babies, while enjoying their brief afterbirth immunities, are so carefully guarded against infection that they have no chance to develop active immunities of their own. Whereas Mexican babies in Lower California presumably are exposed to polio, and develop lifelong "active" immunities...